Martinez and her friends, Kaniya Payne and Sierra Heasley, were excited for the show. When they tried to go inside, Heasley said, "They shut the door on us and said nobody can come in because there's not enough room."

"We was up there packed like sardines. It was arm to arm," said one woman who wanted to go in to see her niece. "I picked my baby up because she was about to be trampled. I couldn't even see her."

Some people lined up for hours to get in. Pittsburgh's Action News 4 was told that some people pre-paid for their tickets, but others showed up later and tried to pay at the door.

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People became so upset that Pittsburgh police were called to calm the situation. Officers remained at the school until the show let out.

"The worst thing is that these children are in there performing, and when they look out, they're not even going to see their parents," Pamela Debardelaben said.

According to a Facebook page, the show was put on by a local dance troupe.

Debardelaben, whose granddaughter was performing, couldn't get into the building. Other relatives couldn't get in either.

"The parents who worked hard -- blood, sweat and tears, money -- and they can't even get in there to see their children perform," Debardelaben said.

Some people who weren't let in remained outside the doors in an effort to get their money back. It's unclear whether they'll get refunds.

Some people who bought tickets Saturday said they got them from a third party. Those buyers questioned whether some of the pre-paid tickets for the show were counterfeited, which they believe may have been one reason the event was oversold.